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High-quality tests for api_utils/utils.py - Latest user text extraction (zero mocking).
Focus: Test _get_latest_user_text with pure function testing (no mocks).
Strategy: Comprehensive edge case coverage for message content extraction.
"""
from typing import List, cast
from models import Message, MessageContentItem
def test_get_latest_user_text_empty_messages():
"""
Test scenario: Empty message list
Expected: Return empty string
"""
from api_utils.utils import _get_latest_user_text
result = _get_latest_user_text([])
assert result == ""
def test_get_latest_user_text_no_user_messages():
"""
Test scenario: No user messages in message list
Expected: Return empty string
"""
from api_utils.utils import _get_latest_user_text
messages = [
Message(role="system", content="System prompt"),
Message(role="assistant", content="AI response"),
]
result = _get_latest_user_text(messages)
assert result == ""
def test_get_latest_user_text_single_user_message_string():
"""
Test scenario: Single user message, content as string
Expected: Return that string
"""
from api_utils.utils import _get_latest_user_text
messages = [Message(role="user", content="Hello, world!")]
result = _get_latest_user_text(messages)
assert result == "Hello, world!"
def test_get_latest_user_text_multiple_user_messages_returns_latest():
"""
Test scenario: Multiple user messages
Expected: Return content of the last user message
"""
from api_utils.utils import _get_latest_user_text
messages = [
Message(role="user", content="First message"),
Message(role="assistant", content="Response"),
Message(role="user", content="Second message"),
Message(role="assistant", content="Another response"),
Message(role="user", content="Latest message"),
]
result = _get_latest_user_text(messages)
assert result == "Latest message"
def test_get_latest_user_text_mixed_roles_returns_latest_user():
"""
Test scenario: Mixed role messages (system, user, assistant)
Expected: Return the last user message
"""
from api_utils.utils import _get_latest_user_text
messages = [
Message(role="system", content="System"),
Message(role="user", content="User 1"),
Message(role="assistant", content="AI 1"),
Message(role="system", content="More system"),
Message(role="user", content="User 2"),
Message(role="assistant", content="AI 2"),
]
result = _get_latest_user_text(messages)
assert result == "User 2"
def test_get_latest_user_text_list_content_with_text_items():
"""
Test scenario: User message content as list (containing text items)
Expected: Concatenate all text items, joined by newline
"""
from api_utils.utils import _get_latest_user_text
messages = [
Message(
role="user",
content=cast(
List[MessageContentItem],
[
{"type": "text", "text": "First part"},
{"type": "text", "text": "Second part"},
{"type": "text", "text": "Third part"},
],
),
)
]
result = _get_latest_user_text(messages)
assert result == "First part\nSecond part\nThird part"
def test_get_latest_user_text_list_content_with_mixed_types():
"""
Test scenario: List content contains text and other types (e.g. image_url)
Expected: Only extract text type content
"""
from api_utils.utils import _get_latest_user_text
messages = [
Message(
role="user",
content=cast(
List[MessageContentItem],
[
{"type": "text", "text": "Text before image"},
{
"type": "image_url",
"image_url": {"url": "http://example.com/img.jpg"},
},
{"type": "text", "text": "Text after image"},
],
),
)
]
result = _get_latest_user_text(messages)
assert result == "Text before image\nText after image"
def test_get_latest_user_text_list_content_empty_text():
"""
Test scenario: List content has empty text items
Expected: Skip empty text items
"""
from api_utils.utils import _get_latest_user_text
messages = [
Message(
role="user",
content=cast(
List[MessageContentItem],
[
{"type": "text", "text": ""},
{"type": "text", "text": "Non-empty"},
{"type": "text", "text": ""},
],
),
)
]
result = _get_latest_user_text(messages)
assert result == "Non-empty"
def test_get_latest_user_text_list_content_no_text_items():
"""
Test scenario: List content has no text type items
Expected: Return empty string
"""
from api_utils.utils import _get_latest_user_text
messages = [
Message(
role="user",
content=cast(
List[MessageContentItem],
[
{
"type": "image_url",
"image_url": {"url": "http://example.com/img.jpg"},
},
],
),
)
]
result = _get_latest_user_text(messages)
assert result == ""
def test_get_latest_user_text_list_content_empty_list():
"""
Test scenario: Content is an empty list
Expected: Return empty string
"""
from api_utils.utils import _get_latest_user_text
messages = [Message(role="user", content=[])]
result = _get_latest_user_text(messages)
assert result == ""
def test_get_latest_user_text_content_is_none():
"""
Test scenario: Content is None (though unusual)
Expected: Return empty string
"""
from api_utils.utils import _get_latest_user_text
# Directly construct a case where content is None (bypass Pydantic validation)
class MockMessage:
def __init__(self):
self.role = "user"
self.content = None
messages = [MockMessage()]
result = _get_latest_user_text(cast(List[Message], messages))
# Function will enter else branch and return ""
assert result == ""
def test_get_latest_user_text_unicode_content():
"""
Test scenario: Content contains Unicode characters
Expected: Correctly handle Unicode characters
"""
from api_utils.utils import _get_latest_user_text
messages = [
Message(role="user", content="hello world"),
Message(role="assistant", content="Response"),
Message(role="user", content="latest message"),
]
result = _get_latest_user_text(messages)
assert result == "latest message"
def test_get_latest_user_text_multiline_string():
"""
Test scenario: Content is multiline string
Expected: Return full multiline string
"""
from api_utils.utils import _get_latest_user_text
multiline = """Line 1
Line 2
Line 3"""
messages = [Message(role="user", content=multiline)]
result = _get_latest_user_text(messages)
assert result == multiline
def test_get_latest_user_text_reversed_iteration():
"""
Test scenario: Verify function iterates messages backwards
Expected: Should return the last user message even if there are other user messages before it
"""
from api_utils.utils import _get_latest_user_text
messages = [
Message(role="user", content="Old message 1"),
Message(role="user", content="Old message 2"),
Message(role="assistant", content="Response"),
Message(role="user", content="Latest message"),
]
result = _get_latest_user_text(messages)
assert result == "Latest message"
def test_get_latest_user_text_special_characters():
"""
Test scenario: Content contains special characters
Expected: Correctly preserve special characters
"""
from api_utils.utils import _get_latest_user_text
messages = [
Message(
role="user",
content="Text with \"quotes\" and 'apostrophes' and \\backslashes\\",
)
]
result = _get_latest_user_text(messages)
assert result == "Text with \"quotes\" and 'apostrophes' and \\backslashes\\"
def test_get_latest_user_text_very_long_content():
"""
Test scenario: Very long content (performance test)
Expected: Able to handle large text
"""
from api_utils.utils import _get_latest_user_text
# Create a 10,000 character long text
long_text = "A" * 10000
messages = [Message(role="user", content=long_text)]
result = _get_latest_user_text(messages)
assert result == long_text
assert len(result) == 10000
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